J. Forster wrote:
OK. Sme GPS receivers have magnetic sensors. What do they do with/about magnetic deviation.
There is a field in one of the NMEA messages for magnetic deviation which some GPS receivers fill in.
I do not know where they get the values. There is a mathematical model available from an appropriate agency (I forget which one right now) that can be used to compute magnetic deviation anywhere on earth. The model is supposed to be good for about five years before the coefficients need to be updated.
Gary _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
